Metal adsorption by agricultural biosorbents: Adsorption isotherm, kinetic and biosorbents chemical structures

Sadeek, Sadeek A.; Negm, Nabel A.; Hefni, Hassan H.H.; Wahab, Mostafa M. Abdel

doi:10.1016/j.ijbiomac.2015.08.031

Cited by 153 publications

(51 citation statements)

References 56 publications

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“…As we all know, industrial processes such as mining, electroplating, electric device manufacturing, and battery manufacturing are all major sources of heavy metal pollution. [1][2][3] Cobalt, one of the heavy metals and an oligo element, is necessary for metabolic processes in humans to ensure good health as it is an important component of vitamin B 12 .…”

Section: Introductionmentioning

confidence: 99%

Fast removal of Co(ii) from aqueous solution using porous carboxymethyl chitosan beads and its adsorption mechanism

2018

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Porous carboxymethyl chitosan (PCMC) beads were synthesized via ionic coacervation/chemical crosslinking, using polyethylene glycol (PEG) as a porogen and calcium chloride and glutaraldehyde as physical and chemical cross-linkers. The as-synthesized PCMC beads were characterized using SEM, EDS, BET, TGA, FTIR and XPS analysis and then tested for the removal of Co(II) from aqueous solution. The effects of the initial pH, Co(II) concentration and temperature were investigated. It was found that the adsorption equilibrium is reached within 6 h and the maximum adsorption capacity is 46.25 mg g À1 .In addition, the kinetics and equilibrium data are well described by pseudo-second-order kinetics and the Langmuir isotherm model. Moreover, the desorption and re-adsorption performance was also studied, and the results revealed that the prepared new adsorbent still showed good adsorption performance after five cycles of regeneration. Finally, the adsorption mechanism, including chemical and physical adsorption, was proposed on the basis of the microstructure analysis, adsorption kinetics and isotherm results, and chemical adsorption was found to be the main adsorption mechanism during the process of the removal of Co(II).

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Section: Introductionmentioning

confidence: 99%

Fast removal of Co(ii) from aqueous solution using porous carboxymethyl chitosan beads and its adsorption mechanism

2018

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“…The major chemical phenylpropane units of lignin consisting of primarily three monomers: syringyl (S), guaiacyl (G) and, P-hydroxy phenol (H) ( Figure 6) [58,59]. Lignin principally accumulation vary largely in SCWs in different plant species.…”

Section: Ligninmentioning

confidence: 99%

“…For the biosynthesis of monolignols there are two main steps, in the first stage more than ten genes are engaged which are including: cinnamate 4-hydroxylase (C4H) [96], 4-coumarate-CoA ligase (4CL) [58], coumarate 3-hydroxylase (C3H) [97], cinnamoyl-CoA reductase (CCR) [98], cinnamyl alcohol dehydrogenase (CAD) [99], ferulate 5-hydroxylase (F5H) [100], and 5-hydroxyferulic acid Omethyltransferase (caffeic acid/COMT) [101], caffeoyl-CoA 3-Omethyltransferase (CCoAOMT) [79], phenylalanine ammonia lyase (PAL) [102], shikimate hydroxycinnamoyl transferase (HCT) [103]. In the second steps, catalyze hydroxylation and methylation reactions then synthesize lignin monomers [104].…”

Section: Lignin Biosynthesis and Degradationmentioning

confidence: 99%

Advances in Genetic Manipulation of Lignocellulose to Reduce Biomass Recalcitrance and Enhance Biofuel Production in Bioenergy Crops

Madadi¹,

Penga²,

Abbas³

2017

J Plant Biochem Physiol

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Lignocellulose biomass derived from plant cell walls is a rich source of biopolymers for the production of biofuels. Biomass recalcitrance is the noticeable and main features of lignocellulose which can reduces by genetic modification of plant cell wall. The aim of the present review is to provide the reader a new insight for enhancing biomass yield and biofuels production. This can be issued by focusing on major perennial grasses, cereal crops and woody feedstock which have high biomass yield or large biomass residues and also the effects of distinctive cell wall polymers (cellulose, hemicellulose, lignin, and pectin) on the enzymatic saccharification of biomass under different pretreatments. Moreover the present review paper will also major gene candidates which are involved plant cell wall biosynthesis, degradation and modification for improving biomass yield and digestibility in transgenic plants and genetic mutants.

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“…The -OH stretching vibrations occur within a broad range of frequencies indicating the presence of free hydroxyl groups and bonded ÀOH bands of carboxylic acids (Kong et al, 2014). The absorption peak at 2917 cm À 1 was aroused due to stretching vibrations of alkyl C-H (Sadeek et al, 2015). The peak observed at 1610 cm À 1 was assigned to the carboxylate anions (-COO-) (Rao and Ikram, 2011).…”

Section: Ftirmentioning

confidence: 99%

Adsorption characteristics of chemically modified Caryota urens seeds for the removal of Cu(II) from aqueous solution: Isotherms and kinetic studies

Rao

Khatoon

2016

Groundwater for Sustainable Development

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Metal adsorption by agricultural biosorbents: Adsorption isotherm, kinetic and biosorbents chemical structures

Cited by 153 publications

References 56 publications

Fast removal of Co(ii) from aqueous solution using porous carboxymethyl chitosan beads and its adsorption mechanism

Fast removal of Co(ii) from aqueous solution using porous carboxymethyl chitosan beads and its adsorption mechanism

Advances in Genetic Manipulation of Lignocellulose to Reduce Biomass Recalcitrance and Enhance Biofuel Production in Bioenergy Crops

Adsorption characteristics of chemically modified Caryota urens seeds for the removal of Cu(II) from aqueous solution: Isotherms and kinetic studies

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